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Date:      Thu, 19 Aug 2010 13:03:40 +0400
From:      Denis Melnikov <dbmelnikov@gmail.com>
To:        freebsd-performance@freebsd.org
Subject:   Does ULE restrict available RAM?
Message-ID:  <AANLkTinD4T%2BMewLfQSnXUbvTHEHx7MNwu_DAw3Y2uXnp@mail.gmail.com>
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Hi!
7.0-RELEASE (amd64)
RAM 33 GB (8*4096+2*512)
2 quad-core Xeons

The server ran GENERIC kernel with 4BSD scheduler earlier. When loaded
with ULE scheduler it has missed 8GB.

dmesg:
usable memory = 26829983744 (25587 MB)
avail memory  = 25999904768 (24795 MB)

# dmidecode -t 17 | grep Size
        Size: 512 MB
        Size: 4096 MB
        Size: No Module Installed
        Size: 512 MB
        Size: 4096 MB
        Size: No Module Installed
        Size: 4096 MB
        Size: 4096 MB
        Size: No Module Installed
        Size: 4096 MB
        Size: 4096 MB
        Size: No Module Installed

It looks like BIOS-level problem, but... maybe ULE restricts RAM?

Hopefully,
Denis

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